(CNN) - It looks like the gloves are beginning to come off between Mitt Romney and Newt Gingrich. The two Republican presidential front-runners are starting to go after each other after trying to stay above the fray over the past many weeks and months.

This should not be surprising since they are in a fierce battle for the party’s nomination and the clock is ticking. Iowa, New Hampshire, South Carolina, Nevada and Florida are coming up quickly.FULL POST

In an interview today with CNN's Wolf Blitzer on "The Situation Room," Minnesota Rep. Michele Bachmann said both former Massachusetts Gov. Mitt Romney and former House Speaker Newt Gingrich have a lot of explaining to do for being "on both sides of the issues.”

Bachmann was also asked about the lastest sexual allegations against Herman Cain, and the controversy that erupted after her appearance on "Late Night with Jimmy Fallon."

(CNN) – Herman Cain told his staff Tuesday he is "reassessing" the viability of his campaign in the wake of a Georgia woman's allegations that she had a long extramarital affair with the Georgia businessman. One top campaign source tells CNN he expects a decision "within a few days" - based on whether fund-raising dries up.

Cain told CNN's Wolf Blitzer on "The Situation Room" Monday that her assertion was coming and would be false.